from rest_framework import serializers
from .models import ApiRequestLog, ErrorLog, SystemEventLog


class ApiRequestLogSerializer(serializers.ModelSerializer):
    username = serializers.CharField(read_only=True)

    class Meta:
        model = ApiRequestLog
        fields = [
            'id', 'timestamp', 'user', 'username', 'ip_address', 'user_agent',
            'method', 'path', 'query_string', 'request_body', 'status_code',
            'response_size', 'duration_ms', 'app_name', 'is_error',
        ]
        read_only_fields = fields


class ApiRequestLogListSerializer(serializers.ModelSerializer):
    class Meta:
        model = ApiRequestLog
        fields = [
            'id', 'timestamp', 'username', 'ip_address', 'method', 'path',
            'status_code', 'duration_ms', 'app_name', 'is_error',
        ]
        read_only_fields = fields


class ErrorLogSerializer(serializers.ModelSerializer):
    class Meta:
        model = ErrorLog
        fields = [
            'id', 'timestamp', 'level', 'message', 'module', 'function',
            'line_number', 'exception_type', 'traceback', 'user', 'ip_address',
            'path', 'request_data', 'is_resolved', 'resolved_at',
            'hash_key', 'occurrence_count',
        ]
        read_only_fields = [
            'id', 'timestamp', 'level', 'message', 'module', 'function',
            'line_number', 'exception_type', 'traceback', 'user', 'ip_address',
            'path', 'request_data', 'hash_key', 'occurrence_count',
        ]


class ErrorLogListSerializer(serializers.ModelSerializer):
    class Meta:
        model = ErrorLog
        fields = [
            'id', 'timestamp', 'level', 'message', 'module', 'exception_type',
            'is_resolved', 'occurrence_count',
        ]
        read_only_fields = fields


class ErrorLogResolveSerializer(serializers.ModelSerializer):
    class Meta:
        model = ErrorLog
        fields = ['is_resolved', 'resolved_at']


class SystemEventLogSerializer(serializers.ModelSerializer):
    username = serializers.CharField(source='user.username', read_only=True)
    target_username = serializers.CharField(source='target_user.username', read_only=True, default=None)
    event_type_display = serializers.CharField(source='get_event_type_display', read_only=True)
    result_display = serializers.CharField(source='get_result_display', read_only=True)

    class Meta:
        model = SystemEventLog
        fields = [
            'id', 'timestamp', 'event_type', 'event_type_display', 'user',
            'username', 'target_user', 'target_username', 'description',
            'metadata', 'ip_address', 'user_agent', 'result', 'result_display',
        ]
        read_only_fields = fields


class SystemEventLogListSerializer(serializers.ModelSerializer):
    username = serializers.CharField(source='user.username', read_only=True)
    event_type_display = serializers.CharField(source='get_event_type_display', read_only=True)

    class Meta:
        model = SystemEventLog
        fields = [
            'id', 'timestamp', 'event_type', 'event_type_display', 'username',
            'description', 'result',
        ]
        read_only_fields = fields


class StatsSummarySerializer(serializers.Serializer):
    total_requests = serializers.IntegerField()
    total_errors = serializers.IntegerField()
    error_rate = serializers.FloatField()
    avg_duration_ms = serializers.FloatField()
    max_duration_ms = serializers.FloatField()
    unique_users = serializers.IntegerField()
    unique_ips = serializers.IntegerField()
    top_status_codes = serializers.ListField()
    error_count_today = serializers.IntegerField()
    request_count_today = serializers.IntegerField()


class PathStatsSerializer(serializers.Serializer):
    path = serializers.CharField()
    request_count = serializers.IntegerField()
    error_count = serializers.IntegerField()
    error_rate = serializers.FloatField()
    avg_duration_ms = serializers.FloatField()


class HourlyStatsSerializer(serializers.Serializer):
    hour = serializers.IntegerField()
    request_count = serializers.IntegerField()
    error_count = serializers.IntegerField()
    avg_duration_ms = serializers.FloatField()


class ErrorTypeStatsSerializer(serializers.Serializer):
    exception_type = serializers.CharField()
    count = serializers.IntegerField()
    last_occurred = serializers.DateTimeField()
    module = serializers.CharField()